Abstract:

The multicast encryption and multi-recipient encryption schemes used in content distribution applications encounter some common problems, such as heavy key management for dynamic groups, high computation and communication costs, etc. Exploits identity-based cryptography is exploited to propose a new group-oriented secure content distribution model and scheme based on security requirements for practical application. The analyses on security and performance show that the scheme meets many essential requirements which include receiver access control, source authentication and non-repudiation, policy driven encryption, has a O(1) computation and communication cost for sender, and owns properties such as simple group key management, low cost of group key update, ease for implementation. It can be used to deploy a commercial multicast content distribution system.